Hilltromper Silicon Valley

We're the nature-worshiping, fun-loving adventurer's guide to the South Bay & SF Peninsula.

Hilltromper is a one-stop outdoor recreation resource for nature lovers, hikers, mountain bikers, birders, climbers, amateur lepidopterists and all the other people we call "Hilltrompers." We create researched guides to local parks and trails, a calendar of outdoor events, news updates on recreational and environmental news and a guide to the community organizations working to make the world a bet  ...